The Raspberry Pi is a very powerful heart of many cool projects including this Raspberry Pi Model Train Controller by MrNotbuyinit. The description of the electronics starts at around 2:35. The prototype interface from the Pi is a simple breadboard which looks to be ideal for quick and easy additions and modifications. The Pi is interfacing with a port expander to get more digital outputs out of the Pi. A keyfob is connected to a receiver board that is great to control the system remotely. IR sensors are used to detect where the trains are on the track.